Riverside mayoral candidate Ed Adkison remained the biggest fundraiser and spender and had the most cash left of his six opponents, according to campaign filings due Thursday.

Adkison, a former councilman who started his mayoral campaign in 2010, also had the most in his campaign coffers in the previous reporting period, which covered the second half of 2011.

Three candidates — nonprofit CEO Peter Benavidez, community volunteer Aurora Chavez, and at-risk youth teacher Dvonne Pitruzzello — have filed forms pledging not to raise or spend more than $1,000 during the campaign.

The latest reports showed Adkison raised nearly $42,000 between Jan. 1 and March 17; his campaign spent a little more than $52,000 and retained $82,700 in cash. He’s raised far more than any other candidate during the election cycle — about $170,000.